Difference between revisions of "Guide number"

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The '''guide number''' is a value indicating the strength of a flashlight. According to Andreas Feininger the guide number helps finding the right aperture for flashlight exposures with the formula
 
The '''guide number''' is a value indicating the strength of a flashlight. According to Andreas Feininger the guide number helps finding the right aperture for flashlight exposures with the formula
  
<UL> guide number </UL>
+
<U>             guide number             </U>
 
distance between flash and image subject
 
distance between flash and image subject

Revision as of 17:33, 28 May 2006

The guide number is a value indicating the strength of a flashlight. According to Andreas Feininger the guide number helps finding the right aperture for flashlight exposures with the formula

guide number distance between flash and image subject